You can use Bink free version to save a movie frame if you want, but it will likely need a bit of editing as the free version doesn't do a perfect job of the transparency.

Yes the good ones are movies but you can use a PNG if you put it on a 1920X1080 transparent background. I have tried to adapt the portrait but it doesn't look right. It would seem since they included a portrait in the first release they would also provide a foreground pic. Oh well...